When two Neutron Stars (NSs) in a binary system, a BNS, coalesce and merge, they are expected to produce a multimessenger signal: gravitational waves (GW), photons from an electromagnetic (EM) counterpart and even neutrinos. One example of such event was the observation of a rapidly fading EM transient in the galaxy NGC 4993, which was spatially coincident[1]} with GW170817. The optical and infrared emission, known as Kilonova (KN) or macronova, was named AT2017gfo. It was possible to identify line features in the spectra, consistent with the presence of light r-process elements (atomic masses of \(A=90–140\) ) powering the emission. In addition, a gamma-ray burst GRB170817A, was also detected. Since then it is now expected that many detections of this kind or similar ones i.e. Black Hole and NS (BHNS) mergers will follow in the future. An updated BNS rate[1]} after the discovery of GW170817 leads to the expectation of potentially detectable dozens of events per year by LIGO/Virgo O4 and O5 runs.
